Fix issues on ScheduleTransactionEditV2 block

[taylorbrooks]

Proposed Changes

• Ensure ReferenceNumber is set on referencePaymentInfo (see old block functionality)
• Only clear payment info if a new payment method is added

Fixes: #5585

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• Bugfix (non-breaking change which fixes an issue)

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[nairdo]

Hi @taylorbrooks We're addressing the #5585 issue in a slightly different manner via e833f01 .

[taylorbrooks]

@nairdo Thanks Nick!

Is there going to be any more versions for v15 cut? It would be awesome to have this change included in the v15 line as well as the v16 line.